Seismic isolation system design and performance of TMT telescope structure

Masahiro Sugimoto; Atsushi Kato; Junji Takaki; Masaki Tabata; Tomoya Hattori; Amir Sadjadpour; Brady Espeland; Hugh Thompson; Satoru Sofuku; Yutaka Ezaki; Noboru Kawaguchi; Tomonori Usuda; Hiroshi Kusumoto; Masao Saito; Hiroshi Terada; Seiichi Tazawa; Kyle Kinoshita

doi:10.1117/12.2631409

29 August 2022 Seismic isolation system design and performance of TMT telescope structure

Masahiro Sugimoto, Atsushi Kato, Junji Takaki, Masaki Tabata, Tomoya Hattori, Amir Sadjadpour, Brady Espeland, Hugh Thompson, Satoru Sofuku, Yutaka Ezaki, Noboru Kawaguchi, Tomonori Usuda, Hiroshi Kusumoto, Masao Saito, Hiroshi Terada, Seiichi Tazawa, Kyle Kinoshita

Author Affiliations +

Proceedings Volume 12182, Ground-based and Airborne Telescopes IX; 1218216 (2022) https://doi.org/10.1117/12.2631409
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Abstract

National Astronomical Observatory of Japan (NAOJ) has had the responsibility for the Telescope Structure System (STR) of Thirty Meter Telescope (TMT) and engaged Mitsubishi Electric Corporation (MELCO) to take over the preliminary/final design and pre-production work since 2012. TMT defines that STR shall be designed to withstand earthquakes up to the levels of the 1000-years annual return period as keeping accelerations at the mirror/instrumental interface points below the specified thresholds. In this paper, we present the Seismic Isolation System (SIS) of TMT STR, as focusing on (1) the design to achieve compatibility of two conflicting performances that are the rigid connection to the ground during normal observations and flexible movement during seismic to suppress the seismic energy, (2) prototype results of the seismic isolation system, and (3) compliance status of the seismic requirements which is evaluated by time history analysis using the Finite Element Method (FEM) model of TMT STR.

Conference Presentation

Citation Download Citation

Masahiro Sugimoto, Atsushi Kato, Junji Takaki, Masaki Tabata, Tomoya Hattori, Amir Sadjadpour, Brady Espeland, Hugh Thompson, Satoru Sofuku, Yutaka Ezaki, Noboru Kawaguchi, Tomonori Usuda, Hiroshi Kusumoto, Masao Saito, Hiroshi Terada, Seiichi Tazawa, and Kyle Kinoshita "Seismic isolation system design and performance of TMT telescope structure", Proc. SPIE 12182, Ground-based and Airborne Telescopes IX, 1218216 (29 August 2022); https://doi.org/10.1117/12.2631409

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